Little backstory.
I had the great idea to "upgrade" this new inverter that I purchased. Bough quality parts from Digikey, new capacitors, new IGBT's. Long story short, no punn intended. Soldered up the new capacitors, great. Tested the unit, worked great. After powering down, I didn't discharge the caps and accidentally shorted the IGBT solder traces on the G2 between Terminal 3 and 2. I thought all was ok until I noticed odd fluctuations in the AC voltage after soldering on new IGBTs. Well the day came on no load where I blew up all 4 IGBT's. Put the original IGBT's on and blew one of them almost instantly. I ordered new control boards thinking that is the issue, however, upon inspection of the traces. It appears the continuity between the pins out for the control board do not align with the schematics I received from the seller of the new control board.

Keep in mind the unit powers on no problem without any IGBT's.


Here's the schematics:




My issue is between IGBT G1 and G2. Instead of getting continuity from pins 2 & 3 to L-VS which is pin 7 on the control board, I get continuity with pin 6 (LPWMH). Between pin 6 and 7 I get 4.77kohms
G2 IGBT Pin 2 has 0.3ohms with Pin 6. Pin 7 is 4.73kohms
G1 IGBT Pin 3 has 0.3ohms with Pin 6. Pin 7 is 4.73kohms

I don't believe according to the schematic I should have any continuity with pin 6 but I do... how would I go about determining where my short is?

Thanks all! First post here and very novice to electronics and schematics reading....

 

Here's some more images from the inverter board:




I have 2 replacement control boards that have the same pin outs and are compatible with the existing V1.5 board.



G2 has a proper square wave at 60Hz.

 

Hi,
Welcome to AAC.
I'm not being picky, but your resoldered board needs a good clean up for starters.
Good luck..........